Biostatistics — MCQs

Q: The following data show systolic blood pressure (SBP) values and the number of patients corresponding to each value: SBP (mmHg) Salt intake 120 3.2 130 4.1 140 5.1 150 6.2

Scatter diagram. ***Scatter diagram*** - A **scatter diagram** (or scatter plot) is the most appropriate graphical method to represent the relationship between **two quantitative variables**, such as blood pressure and salt intake. - It allows visual assessment of the **correlation** or trend (positive, negative, or no correlation) between the two continuous variables. *Line graph* - A **line graph** is typically used to represent **trends over time** (e.g., mortality rates over different years). - It is not suitable for displaying the direct correlation between two distinct quantitative variables like systolic blood pressure and salt intake. *Ogive* - An **ogive** is used for plotting **cumulative frequency** distributions of quantitative data. - It helps in determining the **median** or quartiles, rather than showing independent relationships between two separate variables. *Pie chart* - A **pie chart** is used to represent **proportions or percentages** of a single categorical variable (e.g., distribution of blood types in a population). - It is entirely unsuitable for displaying the relationship between two continuous variables.

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Collection and Presentation of Data

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Measures of Central Tendency

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Measures of Dispersion

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Normal Distribution

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Sampling Methods

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Sample Size Calculation

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Hypothesis Testing

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Tests of Significance

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Correlation and Regression

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Survival Analysis

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Multivariate Analysis

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Statistical Software in Research

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